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    <h3>查找元素类型节点</h3>
    <p>从整个 DOM 树中查找 DOM 节点是学习 DOM 的第一个步骤。</p>
    <ul>
        <li class="item">元素1</li>
        <li class="item">元素2</li>
        <li class="item">元素3</li>
        <li class="item">元素4</li>
    </ul>

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